Electromechanical device.



G. H. ROWE.

ELEOTROMEGHANIUAL DEVIGE.

APPLICATION FILED JUNEQ, 1908.

938,?(38; Patented Nov. 2, 1909.

2 SEEMS-SHEET 1. K 11 G. H. ROWE,

ELECTROMEGHANIGAL DEVICE.

APPLIGATION FILED .TUNEQ, 190B.

Patented NOV. 2, 1909.

2 SHEETS-SHEET 2.

s'rare anion.

RQ'WE, QB IREVEHSIDE, ILLINOIS, ASSIGNOR TO ELECTRO-MAGNETIQ T0314 COIKIQANY, OF CHICAGO, ILLINOIS, A COBEORATION F ILLINOIE ELECTROMEGHANIGAL DEVICE.

Application filed me a, lace. Serial No. 437,577.

To all whom it may concern:

Belt known that I, GEORGE H. Rows, a

citizen of the United States, residing at iiverside, in the county of Cook and State oi lllinois, have invented certain new and useful lm rovements 1n Electromechanical Devices, ot which the following is a specifi rangement to be hereafter described, whereby a higher efficiency of the device as a percussion tool'is obtained.

ihe improvements of the present application have particular utility in adapting my electromechanicaldevice for use as a stamp mill, and it is one of the ob ects of the present invention to provide a stamp mill in which the striking part, or preferably plurality of parts, shall be electro-magnetically cushioned and to otherwise develop my invention along this line. However, the improvements herein shown might obviously be advantageously utilized in connection 'with other forms of apparatus.

My invention has for a further object to provide several. devices, which may be used singly or co'njointly, for varying the stroke of the percussion member, that is, for varying the attractive force between the field magnet and its armature, and consequently the slip between the'same, when they are reciprocz'ited.

l dy invention-has for further objects such improvements in electromechanical devices or in, electro'n agnetic cushion devices as will'be described in the accompanying speci tication and particularly defined by the claims appended thereto.

The invention. is illustrated in the. accompanying drawings, Whe rein-v Eigure 1 is; a side elevation of a stamp mill constructed in accordance with my invention, certain parts not material to the present invention being omitted. Fig. 2 is a partial section on. line 2-2 of Fig. 1,'lo'oking in the direction of thearrows. Fig. 3 is a. diagram illustrating the secondary circult in armature ooih Fig. i is a modi-,

Specification of Letters Patent.

has for. its object to Patented Nov. 2, 1969.

fied form of magnet shown in longitudinal section. Fig. 5 is a diagram illustrating the secondary circuit of this magnet. Fig. 6 is a perspective view of one of the laminae con stituting the ringsof the secondary circuit. 9

Fig. 7 is a similar view of one of the laminae constituting the field magnet core.

Like characters of reference indicate like parts in the several figures of the drawings.

Referring particularly to Figs. 1 and 2, A represents the drive shaft ofthe stamp mill or other percussion device, which may be driven by the pulley 11 and carries the crank disks 12, 13.

B, B are cushioning magnets connected with the crank disks I,12 and 13 by pitmen 14: and 15 respectively, and at an angular distance of 180 apart, so that the magnets work in balanced relation. C, C represent the armatures of these magnets carrying the shoes 16, 17, which work upon dies, one of which is shown at D.

It will be understood that when shaft A is revolved, magnets B, B will bereciprocated, carrying with them their armatures, the field coils of the magnets being supplied with electricityin any manner that may be deemed best, these connections forming no part of the present invention and not having been shown in the drawings. There will be a certain lag and slip between each magnet and its armature which will depend upon the strength of the magnet, the weight of the armature and its shoe, upon theposition of the die, and, when the magnet and its armature are constructed in accordance with my present invention, upon certain conditions which may be varied at will, the de vices for producing which conditions will be described subsequently. This lagging and slip between the magnet and the armature will decrease shock and vibration upon the apparatus, which, of course, is a matter of very great moment in the heavy and expensive apparatus of a stamp mill and, because or its capacity for variation, will permit the length and force of the stroke to be varied at will-between certain limits. Themagnets which I prefer to use in this connection are rectangular in form, as shown by Figs. 1 and 2, the field core being made up of laminated plates of soft iron 18 secured together by' bolts 19, the same bolts preferably binding in side plates 20, which have extensions 21 connected by a cross rod 22,gto which pitman It or 15, as the case may be, is connected. The field core thus formed preterably consists of the pole pieces 23, which have inward extensions it, the pole pieces being connected by yokcs 25 The design oi the field core might be modified. I consider this a particularly suitaole design, as it gives air gaps of very considerable area between the pole pieces and the armature. The armature is also preferably made of laminated plates, indicated by numeral 26, bound together by the bolts 27. To the lower end of the armature is attached the shank 28 ot' the shoe, this shank being made of non magnetic material, preferably of manganese steel, the upper portion of which, 29, is preferably a trifle wider than the armature, so as to form a bearing. To the upper end of the armature is attached another bearing block 30 ot' non-magnetic material. These bearing blocks on the armature work between the bearing blocks 31 on each end of the field core, the latter blocks being of nonmagnetic material and being capable of adjustment by means of screws 32 held in blocks 33 by collars 3%, 3:4. By this arrangement it is possible to provide and maintain a very narrow air gap between the pole pieces and the arnniture. I int-end that this air gap should not be wider than one onehundred and twenty eighth of an inch. The armature made with the central recesses 35, so that each pole piece will have a pull on the armature whether the armature be at. one end of its stroke or the other.

I have shown two magnets arranged at 180 on the drive shaft. It will, of course. be possible to drive a larger number of stamps from the same shaft, in which case they should be arranged symmetrically, so as to balance each other. The proportion between the magnets and the shoes, as shown in Fig. 1, are not intended to be correct. the size of the magnet being exaggerated for purposes of better illustrating their construction. The windings 35 of the field magnets may be of any suitable type, either of insulated wire or insulated ribbons, for example wound around the core 26 and Within the recesses of the field core. The shape of the n'iagnets is not a material consideration in all constructions. I consider the design of'magnet shown as particularly adapted for use in a stamp mill where very heavy weights and powerful forces have to be handled. This construction of magnet, it

will be seen, gives, both because of the Width of the armature and because of the extensions onthe pole pieces, air gaps between the pole pieces and the armature of very great area. The recessing back of the field core gives more room for the windings and increases the lines of force through the pole, pieces. The magnetic lines pass through core 26, then divide, going around canyon the coil througl. .n. two sections o: the liehl core.

in my former application, referred to, l contemplated changing the lag a nd the slip between the magnet and its armature by cl'ial'iging the amount ot current sent to the licld coils. in this applicatioi'i are shown. three methods of ati'ectiug the stroke ol the armature without change in the supply current. I. have shown one of these devices applied to the stamp mill illustrated in l l. and 2. The other two devic t'or accomplishing the same result are shown separately and somewl at diagrammatically, but might, of course, be applied to the magnet 1 at the stamp instead of the device shown, or they might, either one or both, be employed con-- jointly with the device shown, thus fingan intensified ellect. These devicesv 1 varying the amount o't slip between the magru'et. and armature might, of course, be used upon any sort of device for electro-magncth-ally cushioning a strikiiig or moving member. The first of these devices cmut-mplates providing the armature with a series of is; lit rings 30 and connecting these together in series, as shown in Fig. 3, or it would be possible to connect them in parallel, and iii-- sorting in this circuit a variable resistance 38, which, in practice, might, of course, be located at any distance away "front the apparatus. Obviol'lsly, by varying the resistance in this circuit, the intensity of the currents induced therein by the slip or lag between the magnet and its armature would be varied with a consequent change in the magnetic relation between the magnet and armature allecting the length of stroke and quietness of recoil of the latter.

Figs. 4; and 5 illustrate the second on (had for varying the stroke. In this case th' llrhl core, which may likewise be made up of l.|aninated plates 39 (Fig. 7), is provided adjaccnt thereto with a secondary circuit formed of split rings made up of laminzc h; {Fig (3), which rings are connected up in circuit ll, in which is the variable resi-ancc l. variation of the resistance in this c rcuit would obviousl r affect the magnetic relation between the pole pieces and the armature.

The current induced in the secondary cir cuits in the above described methods is always in such a direction that it tends to act in the same direction as the magneto motive force of the primary field winding when the magnetic flux through the second winding i decreases, and to oppose the magneto motive force of the primary field winding when the magnetic flux through the secondary circuit increases. By the introduction of rtsistance in the second circuit around the fields, both action and reaution between field and ttlflxlttture can be varied. Sin'iilarly, by the intro duction of resistance in the secondary circuit seeps-s surrounding the armature, the resultantat traction at any instant can be controlled. The advantage of varying these actions lies the fact that with a given speed and given magnetic strength of primary field, the length and intensity of stroke of the armature'can be varied. Also with a given iength of stroke, the phase between the mcchanically o. erated part and the part held thereto by e ectro-magnetic attraction, both having simple harmonic motion, can be vaied at will. Therefore, the re-action of the element supported by electro-magnetic attraction upon the mechanically operated part can be varied so as to reduce the jar or vibration of the latter.

l do not wish to be limited to the'particular. devices. and constructions shown, the same being merely for purposes of illustration; nor do ll wish to be limited to any particular application of my invention and im provements to any specified use, except so far as such improvements may have a particular utility in such. connections as set forth.

I clain'r:

1. The combination with a drive shaft, of a piurality election'iagnetically cushioned percussion devices connected with the drive shaft as to be driven thereby, said devices being in balanced relation with respect to each other.

2. The combination with a drive shafhof symmetricany arranged cranks on'said shaft, and electro-magnetically cushioned percussion devices whereby said devices are reciprocated by said shaft and are in balanced relation.

The combination with driving means,

of an electro-magnet and armature reciprocated thereby, said magnet and armature having adjustable non-magnetic bearing blocks for positioning and guiding the armature.

at. The combination with driving means, of an electro-ma'gnet and armature reciprocuted thereby, non-magnetic bearing blocks on the magnet, and means for adjusting the same.

The combination with driving means, of an electro-nmgnet and armature reciprocated thereby, a tool adapted to be carried by the armature, and a manganese steel shank connecting the armature and the tool.

6. The combination with driving means, of a magnet and armature reciprocated thereby, non-magnetic bearing blocks on each end of s id armature, and adjustable, non-magnetic bearing blocks on the ends of the magnet.

T. The combination with driving means, of an electro-magnet and armature reciprocated thereby, said magnet comprising pole pieces having parts which extend inwardly connected with the cranks along the armature, substantially as de scribed.

8. 'ihe combination with driving means,

'of an electro-magnet and arn'iature reciprd (rated thereby, said electromaimet provided with pole pieces at each end and said armature being recessed bet-ween tl" portions which are opposite the pole pieces, when the armature is in the normal position under the influence of the magnet, substantially as described.

9. The combination with driving means, of an elcctro-magnet substantially rectan lar in cross section and comprising a pair if cores, and windings recessed in said ccres;

and an armature which works between the i cores of the magnet, substantially as de scribed.

10. The combination with driving means, of an electromagnet and armature rcci; cated thereby, means vior supplying said electromagnet with current, and means for determinably varying the slip between the magnet and armature, said means being in dependent of changes in the current supply to the magnet when the magnet is electrically energized.

11. The combination with drivin means i of a magnet and armature reciprocated thereby; a secondary circuit in which current is induced by the slip between the mag net and the armature, and a variable resistance in said circuit.

12. lhe combination with driving means, of a magnet and. armature reciprocated thereby; a secondary circuit associated with. the armature, and a varible resistance in said circuit.

13. The combination with driving means, of a magnet and armature reciprocated thereby; a secondary circuit comp ising a series of split rings in which current is induced by the slip between the magnet and armature, and a variable resistance in said secondary circuit.

14. The combination with an electromagnet of the solenoid type, comprising a field core and an armature core, of means for reciprocating one of these members, each of said members being provided with bearing blocks arranged above and below but not intervening between the same, whereby said members are guided in their movement with relation to each other, and move in proximity to but out of contact with each other.

15. The combination with a magnet, of a plunger armature for the same, means for reciprocating one of these members, a secondary circuit associated with the armature, and a variable resistance in said circuit.

P. H. TRUMAN, G. SKINNER;

it is hereby certified that in Letters Patent No. 938,708, grenrel November 2,

1909, upon the application of George H. Rowe, of Riverside, Illinois, for an im provement in Electromechanical Devices, an error appears in the printed specification requiring correction, as follows: Page 1, line 56, the Word coil should read 00m; and that the said Letters Patent should be read with this correction therein that the same may cohform to the record of the case in the Patent Ofiicc.

Signed and sealed this 30th Clay of November, A. D., 1909. I

' [SEAL] E. B. MOORE,

(111mm v'ssz'oneo' of flair 26s. 

